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Effect of attapulgite calcination on heavy metal adsorption from acid mine drainage

  • Separation Technology, Thermodynamics
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Abstract

Attapulgite calcined at 973.15K was characterized and utilized as an adsorbent for the removal of heavy metals and neutralization of acid mine drainage (AMD) from a gold mine. Batch adsorption experiments were carried out using a thermostatic shaker. Activated attapulgite showed that it can neutralize AMD as it raised the pH from 2.6 to 7.3 after a residence time of 2 h. Metal ion removal after 2 h was 100% for Cu (II), 99.46% for Fe (II), 96.20% for Co (II), 86.92% for Ni (II) and 71.52% for Mn (II) using a 2.5% w/v activated attapulgite loading. The adsorption best fit the Langmuir isotherm; however, Cu (II), Co (II), and Fe (II) data fit the Freundlich isotherm as well. Calcination at 973.15 K resulted in the reduction of the equilibrium residence time from 4 to 2 h, solid loading reduction from 10 to 2.5% m/v and an increase in maximum adsorption capacity compared with unactivated attapulgite.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of Johannesburg, P. O. Box 17011, Doornfontein 2028, Johannesburg, South Africa

    Thabo Falayi & Freeman Ntuli

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  1. Thabo Falayi
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  2. Freeman Ntuli
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Correspondence to Freeman Ntuli.

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Falayi, T., Ntuli, F. Effect of attapulgite calcination on heavy metal adsorption from acid mine drainage. Korean J. Chem. Eng. 32, 707–716 (2015). https://doi.org/10.1007/s11814-014-0266-1

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  • DOI: https://doi.org/10.1007/s11814-014-0266-1

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